2011-02-01 11:13:42 +00:00
%%% -*- Mode: Prolog; -*-
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Flags was developed at Katholieke Universiteit Leuven
%
% Copyright 2010
% Katholieke Universiteit Leuven
%
% Contributions to this file:
% Author: Theofrastos Mantadelis
% Sugestions: Bernd Gutmann, Paulo Moura
2011-02-15 12:34:48 +00:00
% $Date: 2011-02-15 13:33:01 +0100 (Tue, 15 Feb 2011) $
% $Revision: 15 $
2011-02-01 11:13:42 +00:00
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- module(flags, [flag_define/2,
flag_define/5,
flag_define/7,
flag_set/2,
flag_set/3,
flag_unsafe_set/2,
flag_get/2,
flags_reset/0,
flags_reset/1,
flags_save/1,
flags_load/1,
flag_groups/1,
flag_group_chk/1,
flag_help/0,
flags_print/0,
defined_flag/7]).
:- use_module(library(lists), [append/3, memberchk/2, member/2]).
:- style_check(all).
:- yap_flag(unknown, error).
:- dynamic(['$defined_flag$'/7, '$store_flag_value$'/2]).
:- meta_predicate(flag_define(+, +, +, ?, ?, ?, :)).
:- meta_predicate(flag_define(+, :)).
:- meta_predicate(validate(+, :, ?, +)).
:- multifile(flags_type_definition/3).
flag_define(FlagName, InputOptions):-
strip_module(InputOptions, Module, UserOptions),
Defaults = [flag_group(general), flag_type(nonvar), default_value(true), description(FlagName), access(read_write), handler(true)],
append(UserOptions, Defaults, Options),
memberchk(flag_group(FlagGroup), Options),
memberchk(flag_type(FlagType), Options),
memberchk(default_value(DefaultValue), Options),
memberchk(description(Description), Options),
memberchk(access(Access), Options),
memberchk(handler(Handler), Options),
flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler).
flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description):-
flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, read_write, true).
flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, MHandler):-
strip_module(MHandler, Module, Handler),
nonvar(FlagName),
nonvar(FlagGroup),
nonvar(FlagType),
nonvar(Access),
nonvar(Handler), !,
(\+ atom(FlagName) ->
throw(error(type_error(atom, FlagName), message('Flag name needs to be an atom.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
; \+ atom(FlagGroup) ->
throw(error(type_error(atom, FlagGroup), message('Flag group needs to be an atom.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
; \+ flag_type(FlagType) ->
throw(error(domain_error(flag_type, FlagType), message('Unknown flag type.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Module:Handler))))
; \+ validate_type(FlagType) ->
throw(error(evaluation_error(type_validation), message('Validation of flag type failed, check custom domain.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
; '$defined_flag$'(FlagName, _FlagGroup, _FlagType, _DefaultValue, _Description, _Access, _Handler) ->
throw(error(permission_error(create, flag, FlagName), message('Re-defining a flag is not allowed.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
; \+ memberchk(Access, [read_write, read_only, hidden, hidden_read_only]),
throw(error(domain_error(access, Access), message('Wrong access attribute, available are: read_write, read_only, hidden, hidden_read_only.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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; \+ callable(Handler) -> % the Handler comes from: strip_module(MHandler, Module, Handler)
throw(error(type_error(callable, Handler), message('Flag handler needs to be callable.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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;
validate(FlagType, Module:Handler, DefaultValue, FlagName),
assertz('$defined_flag$'(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler)),
assertz('$store_flag_value$'(FlagName, DefaultValue)),
(Handler == true ->
true
;
call(Module:Handler, stored, DefaultValue)
)
).
flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler):-
throw(error(instantiation_error, message('Flag name, group, type, access and handler need to be instantiated.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler)))).
flag_groups(FlagGroups):-
all(FlagGroup, ('$defined_flag$'(_FlagName, FlagGroup, _FlagType, _DefaultValue, _Description, Access, _Handler), Access \== hidden, Access \== hidden_read_only), FlagGroups).
flag_group_chk(FlagGroup):-
nonvar(FlagGroup),
'$defined_flag$'(_FlagName, FlagGroup, _FlagType, _DefaultValue, _Description, _Access, _Handler), !.
flag_type(Type):-
flags_type_definition(Type, _, _).
% flags_type_definition(TypeName, TypeHandler, TypeValidator).
flags_type_definition(nonvar, nonvar, true).
flags_type_definition(atom, atom, true).
flags_type_definition(atomic, atomic, true).
flags_type_definition(integer, integer, true).
flags_type_definition(float, float, true).
flags_type_definition(number, number, true).
flags_type_definition(ground, ground, true).
flags_type_definition(compound, compound, true).
flags_type_definition(is_list, is_list, true).
flags_type_definition(callable, callable, true).
flags_type_definition(in_interval(Type, Interval), in_interval(Type, Interval), in_interval(Type, Interval)).
flags_type_definition(integer_in_interval(Interval), in_interval(integer, Interval), in_interval(integer, Interval)).
flags_type_definition(positive_integer, in_interval(integer, (0, (+inf))), true).
flags_type_definition(non_negative_integer, in_interval(integer, ([0], (+inf))), true).
flags_type_definition(negative_integer, in_interval(integer, ((-inf), 0)), true).
flags_type_definition(float_in_interval(Interval), in_interval(float, Interval), in_interval(float, Interval)).
flags_type_definition(positive_float, in_interval(float, (0.0, (+inf))), true).
flags_type_definition(non_negative_float, in_interval(float, ([0.0], (+inf))), true).
flags_type_definition(negative_float, in_interval(float, ((-inf), 0.0)), true).
flags_type_definition(number_in_interval(Interval), in_interval(number, Interval), in_interval(number, Interval)).
flags_type_definition(positive_number, in_interval(number, (0.0, (+inf))), true).
flags_type_definition(non_negative_number, in_interval(number, ([0.0], (+inf))), true).
flags_type_definition(negative_number, in_interval(number, ((-inf), 0.0)), true).
flags_type_definition(in_domain(Domain), in_domain(Domain), in_domain(Domain)).
flags_type_definition(boolean, in_domain([true, false]), true).
flags_type_definition(switch, in_domain([on, off]), true).
in_domain(Domain):-
ground(Domain),
is_list(Domain).
in_domain(Domain, Value):-
ground(Value),
memberchk(Value, Domain).
in_interval(Type, Interval):-
is_list(Interval), !,
Interval \== [],
in_interval_conj(Type, Interval).
in_interval(Type, Interval):-
in_interval_single(Type, Interval).
in_interval_conj(_Type, []).
in_interval_conj(Type, [Interval|Rest]):-
in_interval_single(Type, Interval),
in_interval_conj(Type, Rest).
in_interval_single(Type, ([Min], [Max])):-
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!, call(Type, Min),
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call(Type, Max),
Min =< Max.
in_interval_single(Type, ([Min], Max)):-
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!, call(Type, Min),
type_or_inf(Type, Max),
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Min < Max.
in_interval_single(Type, (Min, [Max])):-
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!, type_or_inf(Type, Min),
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call(Type, Max),
Min < Max.
in_interval_single(Type, (Min, Max)):-
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type_or_inf(Type, Min),
type_or_inf(Type, Max),
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Min < Max,
Max - Min > 0.0.
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type_or_inf(Type, Value):-
nonvar(Type), nonvar(Value),
Value == (+inf), !.
type_or_inf(Type, Value):-
nonvar(Type), nonvar(Value),
Value == (-inf), !.
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type_or_inf(Type, Value):- call(Type, Value).
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in_interval(Type, [Interval|_Rest], Value):-
in_interval(Type, Interval, Value), !.
in_interval(Type, [_Interval|Rest], Value):-
in_interval(Type, Rest, Value).
in_interval(Type, ([Min], [Max]), Value):-
!, call(Type, Value),
Value >= Min,
Value =< Max.
in_interval(Type, ([Min], Max), Value):-
!, call(Type, Value),
Value >= Min,
Value < Max.
in_interval(Type, (Min, [Max]), Value):-
!, call(Type, Value),
Value > Min,
Value =< Max.
in_interval(Type, (Min, Max), Value):-
call(Type, Value),
Value > Min,
Value < Max.
validate_type(Type):-
flags_type_definition(Type, _, TypeValidater),
call(TypeValidater).
validate(FlagType, Handler, Value, FlagName):-
strip_module(Handler, _Module, true),
!, flags_type_definition(FlagType, FlagValidator, _),
(call(FlagValidator, Value) ->
true
;
throw(error(validation_error(FlagType, Value), message('Validation of value fails.', validate(FlagType, Value, FlagName))))
).
validate(FlagType, Handler, Value, FlagName):-
flags_type_definition(FlagType, FlagValidator, _),
((call(Handler, validating, Value), (call(FlagValidator, Value); call(Handler, validate, Value))) ->
call(Handler, validated, Value)
;
throw(error(validation_error(FlagType, Value), message('Validation of value fails.', validate(FlagType, Handler, Value, FlagName))))
).
flag_set(FlagName, FlagValue):-
flag_set(FlagName, _OldValue, FlagValue).
flag_set(FlagName, OldValue, FlagValue):-
atom(FlagName),
'$defined_flag$'(FlagName, _FlagGroup, FlagType, _DefaultValue, _Description, Access, Module:Handler), !,
(Access \== read_only, Access \== hidden_read_only ->
validate(FlagType, Module:Handler, FlagValue, FlagName),
retract('$store_flag_value$'(FlagName, OldValue)),
assertz('$store_flag_value$'(FlagName, FlagValue)),
(Handler == true ->
true
;
call(Module:Handler, stored, FlagValue)
)
;
throw(error(permission_error(set, flag, FlagName), message('Setting the flag value is not allowed.',flag_set(FlagName, OldValue, FlagValue))))
).
flag_set(FlagName, OldValue, FlagValue):-
throw(error(existence_error(flag, FlagName), message('The flag is not defined.', flag_set(FlagName, OldValue, FlagValue)))).
flag_unsafe_set(FlagName, FlagValue):-
retract('$store_flag_value$'(FlagName, _)),
assertz('$store_flag_value$'(FlagName, FlagValue)).
flag_get(FlagName, FlagValue):-
\+ '$store_flag_value$'(FlagName, _),
throw(error(existence_error(flag, FlagName), message('The flag is not defined.', flag_get(FlagName, FlagValue)))).
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flag_get(FlagName, FlagValue):-
'$store_flag_value$'(FlagName, FlagValue).
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flags_reset:-
retractall('$store_flag_value$'(_, _)),
'$defined_flag$'(FlagName, _FlagGroup, _FlagType, DefaultValue, _Description, _Access, Module:Handler),
assertz('$store_flag_value$'(FlagName, DefaultValue)),
(Handler == true ->
true
;
call(Module:Handler, stored, DefaultValue)
),
fail.
flags_reset.
flags_reset(FlagGroup):-
'$defined_flag$'(FlagName, FlagGroup, _FlagType, DefaultValue, _Description, _Access, Module:Handler),
retractall('$store_flag_value$'(FlagName, _)),
assertz('$store_flag_value$'(FlagName, DefaultValue)),
(Handler == true ->
true
;
call(Module:Handler, stored, DefaultValue)
),
fail.
flags_reset(_).
flags_save(FileName):-
tell(FileName),
catch(('$store_flag_value$'(FlagName, Value),
write_canonical('$store_flag_value$'(FlagName, Value)),
write('.'), nl),
Exception, clean_and_throw(told, Exception)),
fail.
flags_save(_FileName):-
told.
flags_load(FileName):-
see(FileName),
catch((read('$store_flag_value$'(FlagName, Value)),
flag_set(FlagName, Value)),
Exception, clean_and_throw(seen, Exception)),
fail.
flags_load(_FileName):-
seen.
clean_and_throw(Action, Exception):-
Action,
throw(Exception).
flag_help:-
format('This is a short tutorial for the flags library.~nExported predicates:~n'),
format(' flag_define/5 : defines a new flag without a handler~n'),
format(' flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description)~n'),
format(' flag_define/6 : defines a new flag with a handler~n'),
format(' flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Handler)~n'),
format(' FlagName : the name of the flag~n'),
format(' FlagGroup : the name of the flag group~n'),
format(' FlagType : the type of the flag available types are:~n'),
flag_help_types,
format(' DefaultValue : the default value for the flag~n'),
format(' Description : a flag description~n'),
format(' Handler : a handler~n'),
flags:flag_help_handler,
format(' flag_groups/1 : returns all the flag groups in a list~n'),
format(' flag_group_chk/1 : checks if a group exists~n'),
format(' flag_set/2 : sets the value of a flag~n'),
format(' flag_get/2 : gets the value of a flag~n'),
format(' flag_store/2 : sets the value of a flag ignoring all tests and handlers~n'),
format(' flag_reset/0 : resets all flags to their default value~n'),
format(' flag_reset/1 : resets all flags of a group to their default value~n'),
format(' flag_help/0 : this screen~n'),
format(' flags_print/0 : shows the current flags/values~n').
flag_help_types:-
flag_type(FlagType),
format(' ~w~n', [FlagType]),
fail.
flag_help_types.
flag_help_handler:-
format(' Handler important notes:~n'),
format(' Conjuction: external_handler(validating, Value):-...~n'),
format(' Disjunction: external_handler(validate, Value):-...~n'),
format(' After: external_handler(validated, Value):-...~n'),
format(' After set: external_handler(stored, Value):-...~n'),
format(' this is implemented as (validating,(original;validated))~n'),
format(' validating|original|validate|result~n'),
format(' true | true | true | true~n'),
format(' true | true | fail | true~n'),
format(' true | fail | true | true~n'),
format(' true | fail | fail | fail~n'),
format(' fail | true | true | fail~n'),
format(' fail | true | fail | fail~n'),
format(' fail | fail | true | fail~n'),
format(' fail | fail | fail | fail~n'),
format(' Default behaviour is validating->true, validate->fail~n'),
format(' To completly replace original set validate->true~n'),
format(' To add new values to original set validating->true~n'),
format(' To remove values from original set validate->fail~n'),
format(' Example definition with a handler:~n'),
format(' flag_define(myflag, mygroup, in_interval(integer, [(-5, 5),([15],[25])]), 0, description, my_handler).~n'),
format(' my_handler(validate, Value):-Value is 10.~n'),
format(' my_handler(validating, Value).~n'),
format(' my_handler(validated, Value).~n'),
format(' my_handler(stored, Value).~n'),
format(' This has defined a flag that accepts integers (-5,5)v[15,25].~n'),
format(' The handler adds the value 10 in those.~n').
flags_print:-
flag_groups(Groups),
forall(member(Group, Groups), flags_print(Group)).
flags_print(Group):-
format(' ~w:~n~w~38+ ~w~19+ ~w~10+ ~w~10+~n', [Group, 'Description', 'Domain', 'Flag', 'Value']),
fail.
flags_print(FlagGroup):-
'$defined_flag$'(FlagName, FlagGroup, FlagType, _DefaultValue, Description, Access, _Handler),
Access \== hidden, Access \== hidden_read_only,
flag_get(FlagName, Value),
format('~w~38+ ~w~19+ ~w~10+ ~q~10+~n', [Description, FlagType, FlagName, Value]),
fail.
flags_print(_).
defined_flag(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler):-
'$defined_flag$'(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler),
Access \== hidden, Access \== hidden_read_only.
defined_flag(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler):-
nonvar(FlagName), nonvar(FlagGroup),
'$defined_flag$'(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler).
